Power supplies
The S4100–ON Series (S4128F-ON and S4148F-ON) switch ships with two AC or DC power supplies.
The power supplies have two air-ow directions, normal and reverse. Normal is from the I/O-side to the PSU-side. Reverse is from the
PSU-side to the I/O-side.
The PSUs are eld replaceable. When running with full redundancy—two power supplies installed and running, you can remove and replace
one PSU without disrupting trac.
CAUTION: To prevent electrical shock, ensure that the switch is grounded properly. If you do not ground your equipment
correctly, excessive emissions may result. Use a qualied electrician to ensure that the power cables meet your local electrical
requirements.
NOTE: Connect the power supply to the appropriate branch circuit protection as dened by your local electrical codes and verify
that the remote power source complies with the switch input power specications.
NOTE: If you use a single PSU, install a blank plate in the other PSU slot. Use power supply 2 (PSU2) as the blank plate slot. To
install the blank plate, use a #1 Philips screw driver.
NOTE: ESD damage can occur if components are mishandled. Always wear an ESD-preventive wrist or heel ground strap when
handling the S4100F–ON Series switch and its components.
Topics:
• Components
• AC or DC power supply installation
• DC power supply connection
Components
The following power supply options are available for the S4100–ON Series (S4128F-ON and S4148F-ON) switch:
• AC or DC power supply with integrated fan
• AC or DC power supply with integrated reverse ow fan
Power supply 1 (PSU1) is on the left side of the switch; power supply 2 (PSU2) is on the right side of the switch.
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Power supplies 29
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